QPSK信号在MATLAB上的仿真代码，载波频率为10HZ，信息速率为1Baud，信号经过带宽为2HZ的系统。-QPSK signal in the simulation of MATLAB code, the carrier frequency to 10HZ, the information rate of 1Baud, signal bandwidth of the system 2HZ.

仿真FFT参数对采用FFT算法分析信号频谱的影响。产生频率分别为2Hz，2.05Hz的正弦波合成信号，采样频率＝10Hz。-Simulation of the influence of FFT parameters on the frequency spectrum of the signal using FFT algorithm analysis. The frequency of sine wave synthesis are respectively 2Hz, 2.05Hz signal

本源程序是基于MATLAB平台开发的一个滤波器的小插件，本滤波器是低通滤波器，可以滤掉低于2Hz的频率，如果想得到带通滤波器或者高通滤波器，将里面的某些语句更改即可。-The source is a filter based on MATLAB platform development of small plug-in, this filter is a low-pass filter, it can filter out frequencies below 2Hz, if want to ge